Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 47: Experimental techniques in astroparticle physics II

T 47.4: Vortrag

Dienstag, 16. März 2021, 16:45–17:00, Tv

Optimization and decision-making for the outer pressure vessel of the IceCube-Upgrade WOM — •Nick Jannis Schmeißer for the IceCube collaboration — Bergische Universität Wuppertal (BUW), FK 4 - Astroparticle Physics, Gaußstr. 20, 42119 Wuppertal

In 2023/24 the IceCube Neutrino Observatory is going to be enhanced by the IceCube Upgrade. Therefore over 700 new photosensors are planned to be deployed in addition to the old IceCube detector. This deployment will contain the Wavelength-shifting Optical Module (WOM) among other sensors. The WOM's goal is to achieve a large photosensitive area combined with an improved signal to noise ratio and UV-sensitivity via wavelength shifting and light guiding techniques. A combination of wavelength-shifting dies allows to effectively capture photons below 400nm that are abundantly generated in the Cherenkov process and reemit them close to the peak sensitivity of PMTs at 450nm. The lower edge of the sensitivity is typically given by the housing of the module. To reach this goal the pressure vessel of the WOM needs to fulfill different requirements for example to ensure most of the photons hitting the sensitive area get detected. Also the pressure resistance needs to be taken into account so that the WOM resists the pressure inside the ice. This presentation discusses these key points in the development of the pressure vessel. Especially the decision-making on which glass to use while considering the transmission in the critical sensitive area between 250 nm and 400 nm is going to be presented.